Clean-up: fix a unused private field warning.

nkcsgexi · nkcsgexi · commit 7a791862f50e · 2017-02-18T11:32:33.000-08:00
diff --git a/include/swift/Basic/Demangle.h b/include/swift/Basic/Demangle.h
@@ -245,8 +245,6 @@ class Demangler;
 /// allocations.
 ///
 class Context {
-  Demangler *D;
-
   friend class Node;
 
 public:
